Influência do desbaste na forma do fuste de povoamentos naturais de Eremanthus incanus (Less.) Less

Ferreira, Gabriel W.D.; Filho, Antônio Carlos Ferraz; Pinto, Ana Luiza Rufini; Scolforo, José Roberto Soares

doi:10.5433/1679-0359.2014v35n4p1707

Cited by 7 publications

(6 citation statements)

References 5 publications

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“…The application of our equations to plantations using more conventional spacing (e.g. 3x3 to 4x4 m spacing, as mentioned by Yahya et al 1999 andYeboah et al 2014) must be done with care, since spacing can influence stem form (Nogueira et al 2008, Ferreira et al 2014. However, the information generated in this paper contributes to knowledge and establishment of Khaya ivorensis silviculture and are especially important considering the lack of information on this species.…”

Section: Assessment Of the Prediction Ability Of The Volume Modelsmentioning

confidence: 87%

Volume equations for Khaya ivorensis A. Chev. plantations in Brazil

Oliveira

Ribeiro

Filho

et al. 2018

An. Acad. Bras. Ciênc.

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African mahogany (Khaya spp.) plantations are in expansion in Brazil and in the world. This fact justifies the need for studies related to its growth and yield. This paper aimed to evaluate the performance of single-entry and double-entry models for estimating merchantable and total volume for Khaya ivorensis plantations before the first thinning (7 years) and expected final cut (15 years). Volume data was from 100 and 46 trees in Minas Gerais and Pará states, respectively, by using an electronic dendrometer (Criterion RD 1000). Observed volumes were calculated by Smalian's formula. To validate the optical dendrometer, 10 trees were felled and had their volume measured, and compared with the volumes measured indirectly. The results showed that observed and estimated volumes were statistically equal, and that double-entry models were more precise than single-entry models. Schumacher and Hall model was the best equation to estimate merchantable volume for first thinning and for final cut in Minas Gerais stands. Spurr logarithmized model was the best equation to estimate total volume for first thinning and Spurr model for final cut in Pará stands. All chosen equations can be used to quantify merchantable and total volumes of Khaya ivorensis grown under similar conditions.

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Section: Assessment Of the Prediction Ability Of The Volume Modelsmentioning

confidence: 87%

Volume equations for Khaya ivorensis A. Chev. plantations in Brazil

Oliveira

Ribeiro

Filho

et al. 2018

An. Acad. Bras. Ciênc.

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“…The shape of the bole generally shows considerable differences such as straight from top to bottom, satiation, curve (bend), or a sharp and distinct or indistinct trunk. Tree shape is generally influenced by a broad range of factors such as: tree genetic make-up (Larson 1963;Meng 2006), tree characteristics (e.g., age, crown size, position of branch and species) (Gray 1956;Li and Weiskittel 2010;Muhairwe 1993;Muhairwe et al 1994), stand characteristics (e.g., density and stand age) (Gray 1956;Larson 1963;Muhairwe 1993;Sharma and Zhang 2004), site characteristics (e.g., water and nutrients) (Calama and Montero 2006;Larson 1963;Metzger 1894), climatic factors (e.g., mean annual precipitation and end of frost-free period) (Nigh and Smith 2012;Schneider 2018), and management and land use actions (e.g., thinning and pruning) (Ferreira et al 2014;Tasissa and Burkhart 1998;Tasissa et al 1997).…”

Section: Introductionmentioning

confidence: 99%

Tree profile equations are significantly improved when adding tree age and stocking degree: an example for Larix gmelinii in the Greater Khingan Mountains of Inner Mongolia, northeast China

et al. 2020

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Tree age (AGE) and stocking degree (P) strongly influence tree shape, but their effects have been neglected in most tree profile equations. In addition, data used to build traditional tree profile equations usually do not meet the statistical requirements of independence and identical distribution of observations. The main objectives were to present a method to improve taper equations with measurements easily collected in tree inventories (age, stocking degree) and also improve the statistical accuracy of those equations by selecting parameters with a more rigorous way than that is traditionally being done. We evaluated the effects of incorporating age and stocking degree as regressors in tree profile equations selected among 30 candidate foundation equations and parameterized with data from 1,858 Larix gmelinii (Rupr.) trees growing in the northern China. We used nonlinear mixed-effects models to minimize statistical problems present when building traditional tree profile equations: lack of independence and identical distribution of observations, random effects related to individual trees. Equations incorporating age and stocking degree significantly improved their accuracy. When the equation parameters were estimated with mixedeffects models containing exponential variance functions and accounting for non-independence of observations from the same tree, diameters at any height along the tree bole were more accurately estimated. We demonstrate a new methodology to build more accurate tree profile equations that could support better economic valorization of timber and improve calculations of carbon flows in forests, not only for natural L. gmelinii forest but for other species growing in dense natural stands around the globe.

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“…Capaz de se desenvolver em áreas degradadas, se destaca dentre as poucas espécies que conseguem sobreviver nessas áreas (Scolforo et al, 2012). Dentre as espécies florestais brasileiras de múltiplo uso, os indivíduos de E. incanus têm se destacado pela sua rusticidade, tornando imprescindível a realização do manejo florestal (Ferreira et al, 2014).…”

Section: Introductionunclassified

Idade Relativa e Tempo de Passagem para Eremanthus incanus (Less.) Less em Uma Área em Recuperação no Município de Diamantina, MG

et al. 2016

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RESUMOO objetivo deste estudo foi determinar a idade relativa e o tempo de passagem dos indivíduos de Eremanthus incanus presente em uma área em recuperação, com avaliações periódicas ao longo de 4 anos. Os dados utilizados foram coletados na cidade de Diamantina, MG, por meio de inventários florestais contínuos em uma área de aproximadamente 2,15 hectares, totalizando 9 inventários florestais, os quais foram agrupados em classe de diâmetro de 3 e 5 cm. Foram testados três modelos para estimar o incremento periódico médio mensal em diâmetro por centro de classe diamétrica. Através da melhor equação foram calculados a idade relativa e o tempo de passagem. Todos os três modelos ajustados foram melhores com a amplitude de classe de 3 cm. A idade relativa e o tempo de passagem para os indivíduos de E. incanus alcançarem a menor classe de diâmetro foram de 4 e 2 anos, respectivamente.Palavras-chave: incremento periódico, manejo florestal, centro de classe diamétrica. Relative Age and Passage Time for Eremanthus incanus (Less.) Less in A Recovery Area in the Municipality of Diamantina-MG ABSTRACTThis study aimed to determine the relative age and the passage time of Eremanthus incanus individuals present in a recovery area, with periodic evaluations over four years. Data were collected in the city of Diamantina-MG, through continuous forest inventories in an area of 2.0 hectares, totaling nine forest inventories, which were grouped in 3 to 5 cm diameter classes. Three models were tested to estimate the monthly diameter average periodic increment by diameter class center. Relative age and passage time were calculated based in the best equation.All three adjusted models were better with the 3 cm class range. The relative age and the passage time for E. incanus individuals to achieve the smallest class size was 4 and 2 years, respectively.

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Influência do desbaste na forma do fuste de povoamentos naturais de Eremanthus incanus (Less.) Less

Cited by 7 publications

References 5 publications

Volume equations for Khaya ivorensis A. Chev. plantations in Brazil

Volume equations for Khaya ivorensis A. Chev. plantations in Brazil

Tree profile equations are significantly improved when adding tree age and stocking degree: an example for Larix gmelinii in the Greater Khingan Mountains of Inner Mongolia, northeast China

Idade Relativa e Tempo de Passagem para Eremanthus incanus (Less.) Less em Uma Área em Recuperação no Município de Diamantina, MG

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